Wset Diploma D1 Questions And Correct Detailed Answers (Actual Exam 2025) Verified Already Graded A+

QUESTION 1: Name the most important North American grape species. ANSWER 1: Vitis labrusca, Vitis riparia, Vitis berlandieri, and Vitis rupestris. ________________________________________ QUESTION 2: What are the four main sections of a grape vine? ANSWER 2: The main shoots, one‐year‐old wood, permanent wood, and the roots. ________________________________________ QUESTION 3: What comprises the canopy of a vine? ANSWER 3: The canopy consists of the main shoots and all their major structures—stem, buds, leaves, lateral shoots, tendrils, and inflorescences/grape bunches. ________________________________________ QUESTION 4: From what do the main shoots grow, and when do they grow? ANSWER 4: The main shoots grow from buds retained from the previous year, and they grow in spring. ________________________________________ QUESTION 5: Where are carbohydrates stored in a vine? ANSWER 5: Carbohydrates are stored in the stems, trunks, and roots. ________________________________________ QUESTION 6: Define “lignify.” ANSWER 6: Lignification is the process whereby green shoots become woody and rigid; once lignified, they are referred to as canes. ________________________________________ QUESTION 7: Where do buds form on a grape vine? ANSWER 7: Buds form between the leaf stalk (petiole) and the stem. ________________________________________ QUESTION 8: Define the two types of buds found on a vine. ANSWER 8: • Compound buds: Form in one growing season and break open the following season to produce main shoots; they typically consist of a primary bud, a secondary bud, and sometimes a tertiary bud. • Prompt buds: Form and break open within the same season to produce lateral shoots. ________________________________________ QUESTION 9: What is the main function of lateral shoots, and when might they be desirable or undesirable? ANSWER 9: Lateral shoots serve as a backup growth if the tip of the main shoot is damaged and can provide additional leaves for photosynthesis—particularly when they occur near the end of the main shoot. However, laterals growing near the base can be undesirable as they impede air flow and may excessively shade the fruit. ________________________________________ QUESTION 10: What is meant by the term “second crop” in viticulture? ANSWER 10: The term “second crop” refers to the inflorescences produced by lateral shoots. ________________________________________ QUESTION 11: Define “green harvesting.” ANSWER 11: Green harvesting is the practice of removing the second crop (excess clusters) during the summer to improve the quality of the remaining fruit.